Camera Interface
2-12 Basler A500k Series
PRELIMINARY
2.4 Input Signals
The A500k receives the RS-644 input signals ExSync, ExClk, ExFlash, and RxD of the serial
interface. Section 2.4.1 describes the function of the ExSync signal, Section 2.4.2 describes the
function of the ExFlash signal. RxD of the serial communication is described in Section 2.6.
2.4.1 ExSync: Controls Frame Readout and Exposure Time
The ExSync input signal can be used to control exposure and readout of the A500k. ExSync is an
LVDS signal as specified for RS-644. The ExSync input corresponds to the camera control signal
CC1 as defined in the Camera Link standard. CC2 and CC4 are not used in this camera.
The camera can be programmed to function under the control of an externally generated sync
signal (ExSync) in three exposure time control modes. In these modes, edge-controlled, level-
controlled and programmable, the ExSync signal is used to control exposure time and frame read
out. For more detailed information on the three modes, see Section 3.2.
ExSync can be a periodic or non-periodic function. The frequency of the ExSync signal
determines the camera’s frame rate in these modes.
Note that ExSync is edge sensitive and therefore must toggle. Minimum high time for the ExSync
signal is 2 µs, minimum low time 3 µs. These times can change depending on the exposure mode
and timing selected, please see sections 3.3.2.1 to 3.3.3.4.
2.4.2 ExFlash from the Frame Grabber
The first Channel Link contains an LVDS input for the ExFlash signal. With the corresponding
register setting, this input can be tied to the FlashOut signal of the Flash connector. The ExFlash
signal is not used by the camera itself. The ExFlash input corresponds to the camera control signal
CC3 as defined in the Camera Link standard.
The minimum pulse width of ExFlash is 1 µs, there are no further restrictions.
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